Method of securing a battery terminal to an external wall

Abstract

An electric storage battery has a terminal bush located at one end within an aperture in an external wall of the battery. There is a clearance defined between a portion of the external wall around the aperture and the end of the bush extending into the aperture, and the clearance is occupied by a moulded filler material. Normally the external wall in which the bush is located is a lid closing an open end of the battery casing.

I claim: 
     
       1. A method of securing a battery terminal bushing to an external wall of an electric storage battery, said external wall being formed of a synthetic thermo plastic material, said method including the steps of: locating one end of the terminal busing in an aperture in said external wall, there being a clearance between the bushing and said wall, said wall including an integral annular ridge extending around said aperture;   partially melting said integral annular ridge adjacent to said molten filler material by injection molding a molten synthetic plastic filler material into said clearance; and   allowing said filler material to cool and solidify forming a liquid-tight joint between said filler material and said integral annular ridge.   
     
     
       2. A method as claimed in claim 1, wherein the battery includes a casing closed at an open end by a lid in said external wall as defined by said lid. 
     
     
       3. A method as claimed in claim 1, and including the further step of providing a lead-in for the terminal bush by employing a suitably configured die member during the melting operation.